考虑应力罗德角的修正剑桥模型在ABAQUS中的数值实现及其在海堤工程中的应用  

Numerical Implementation of the Modified Cam-Clay Model Considering the Stress Lode Angle in Software ABAQUS and Its Application to Seawall Engineering

作　　者：张其一[1] 曲程 ZHANG Qiyi;QU Cheng(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《海岸工程》2024年第3期163-170,共8页Coastal Engineering

摘　　要：基于有限元软件ABAUQS提供的UMAT用户材料子程序接口,考虑应力罗德角对黏土力学特性的影响,改进了修正剑桥模型中的临界状态线。采用相关联流动法则,通过引入剪胀比推导了弹塑性矩阵,从而开发了考虑应力罗德角影响的修正剑桥模型UMAT子程序。运用该子程序模拟了正常固结土的静三轴和真三轴试验,并分析了应力罗德角改变引起的海堤最终沉降量的变化。模拟结果表明,考虑应力罗德角的修正剑桥模型能够较好模拟土体的应力-应变特性;应力罗德角变化对海堤最终沉降量的影响随地基深度增加而降低,对海堤-地基交界处的最终沉降量影响最为显著。Based on the UMAT user material subroutine interface provided by the finite element software ABAQUS and by considering the impact of the Stress Lode Angle on the mechanical properties of clays,the critical state line in the modified Camclay model is improved.The elastic-plastic matrix is derived by introducing shear expansion ratio and using the correlated flow rule,thus developing the UMAT subroutine of the Cam-clay model considering the influence of the Stress Lode Angle.By using this subroutine,the static triaxial and true triaxial tests of the soils consolidated normally are simulated,and meanwhile the changes of the final settlement of the seawall,which is caused by changing the Stress Lode Angle,are analyzed.The results show that the Cam-clay model considering the Stress Lode Angle can well simulate the stress-strain characteristics of soil.The influence of the change in Stress Lode Angle on the final settlement of the seawall decreases with the increase of the foundation depth,with the influence on the final settlement at the seawall-foundation junction is the most significant.

关 键 词：ABAQUS 应力罗德角 修正剑桥模型 参数敏感性 海堤沉降 

分 类 号：P753[交通运输工程—港口、海岸及近海工程] TU43[天文地球—海洋科学]